nping does not call anything nl_* related so it should not link against libnl (bug #529244)
Patching configure.ac would be best but eautoreconf does not handle the subdirs very well.

--- a/nping/configure
+++ b/nping/configure
@@ -4865,64 +4865,6 @@
 fi
 
 
-# libpcap can require libnl
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for library containing nl_handle_alloc" >&5
-$as_echo_n "checking for library containing nl_handle_alloc... " >&6; }
-if ${ac_cv_search_nl_handle_alloc+:} false; then :
-  $as_echo_n "(cached) " >&6
-else
-  ac_func_search_save_LIBS=$LIBS
-cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-
-/* Override any GCC internal prototype to avoid an error.
-   Use char because int might match the return type of a GCC
-   builtin and then its argument prototype would still apply.  */
-#ifdef __cplusplus
-extern "C"
-#endif
-char nl_handle_alloc ();
-int
-main ()
-{
-return nl_handle_alloc ();
-  ;
-  return 0;
-}
-_ACEOF
-for ac_lib in '' nl; do
-  if test -z "$ac_lib"; then
-    ac_res="none required"
-  else
-    ac_res=-l$ac_lib
-    LIBS="-l$ac_lib  $ac_func_search_save_LIBS"
-  fi
-  if ac_fn_c_try_link "$LINENO"; then :
-  ac_cv_search_nl_handle_alloc=$ac_res
-fi
-rm -f core conftest.err conftest.$ac_objext \
-    conftest$ac_exeext
-  if ${ac_cv_search_nl_handle_alloc+:} false; then :
-  break
-fi
-done
-if ${ac_cv_search_nl_handle_alloc+:} false; then :
-
-else
-  ac_cv_search_nl_handle_alloc=no
-fi
-rm conftest.$ac_ext
-LIBS=$ac_func_search_save_LIBS
-fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_search_nl_handle_alloc" >&5
-$as_echo "$ac_cv_search_nl_handle_alloc" >&6; }
-ac_res=$ac_cv_search_nl_handle_alloc
-if test "$ac_res" != no; then :
-  test "$ac_res" = "none required" || LIBS="$ac_res $LIBS"
-
-fi
-
-
 # We test whether they specified openssl desires explicitly
 use_openssl="yes"
 specialssldir=""